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PCA9550 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9550 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 17 page Philips Semiconductors Product data PCA9550 2-bit I2C LED driver with programmable blink rates 2003 May 02 9 Programming example The following example will show how to set LED0 to blink at 1 Hz at a 50% duty cycle. LED1 will be set to blink at 4 Hz, 25% duty cycle. Table 1. I2C-bus Start S PCA9550 address with A0 = LOW COh PSC0 subaddress + auto-increment 11h Set prescaler PSC0 to achieve a period of 1 second: Blink period + 1 + PSC0 ) 1 38 PSC0 = 37 25h Set PWM0 duty cycle to 50%: 256 – PWM0 256 + 0.5 PWM0 = 128 80h Set prescaler PCS1 to achieve a period of 0.25 seconds: Blink period + 0.25 + PSC1 ) 1 38 PSC1 = 9 09h Set PWM1 output duty cycle to 25%: 256 – PWM1 256 + 0.25 PWM1 = 192 C0h Set LED0 to PWM0 and set LED1 to blink at PWM1 OEh Stop P |
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